Key Roofing Considerations for Multi-Dwelling Units – Part 2: Energy Efficiency & Other Cost Savings

The first part of this blog discussed roofing materials and their need for maintenance. Today, we will consider another important aspect: energy use and efficiency.

The US Department of Energy’s Energy Efficiency and Renewable Energy office says that the approach to residential and commercial building technology in this era is focused on sustainability. It’s a fast-growing global trend for good reason. Rising energy demands continue to draw from depleting supplies, which can only mean a less-than-pleasant future scenario for multi-level residential buildings.

Your roof can help reduce the energy loads on your entire building in a number of ways. Here are a few options that promote sustainability:

• Light-colored roofs. Findings of a recent study commissioned by the US Environmental Protection Agency say that reflective roof coverings can help shave significant costs off your utility bills. This is because light-colored roofs absorb less heat than dark-colored ones, which keeps your entire building cooler – and lessens the demand on artificial means of cooling. Reflective roofs are especially ideal for hot and sunny climates.

• Green roofs. Green roofs are vegetative roofs, which are mini-habitats in and of themselves. They can effectively counter chemical damage from the sun, as well as reduce run-off. If you have the budget for it, a green roof can also supplement a storm water facility to help you save even more.

• Compliance with existing energy recommendations. There are various programs – such as ENERGY STAR® and LEED – dedicated to promoting more sustainable use of resources for roofing and other exterior parts of your home. Follow their established energy recommendations to help you curb expenses, as well as secure permits and credits.

• Complementing your building envelope. The Whole Building Design Guide recommends that roofing assemblies be built to complement the property’s envelope. Cool metal roofing, for instance, is best practiced according to recommended design considerations and energy guidelines.

If your multi-family residential unit is still under construction, checking for updates to the National Building Code of Canada is important. For instance, in the US, the Department of Energy requires that new residential buildings should meet or exceed the 2009 IECC level, if it is cost-effective for the building. If not, an agency should evaluate alternate designs to determine the most energy-efficient one.

Up next are important installation considerations, to ensure that you do not miss out on the benefits from good materials and maintenance practices.